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Interstellar graphite in Murchison: Continued search for isotopically distinct componentsWe have measured C-, N-, and O-isotopic ratios of individual graphite grains from the Murchison density fractions KFB1 (2.1-2.15 g/cc) and KFC1 (2.15 -2.20 g/cc). According to the C-isotopic composition, KFC1 consists of two populations: one has light C while the other has heavy C. In addition to these two populations, KFB1 also contains grains whose C-isotopic ratios are approximately normal. In view of these isotopic distributions, it is difficult to understand why the Kr-isotopic compositions of these two separates are so different. In contrast to the lighter density fractions KE1 (1.6-2.05 g/cc) and KFA1 (2.05-2.10 g/cc), the separates KFB1 and KFC1 do not seem to contain many grains with significant O-18 excess.
Document ID
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Amari, Sachiko
(Washington Univ. Saint Louis, MO, United States)
Zinner, Ernst
(Washington Univ. Saint Louis, MO, United States)
Lewis, Roy S.
(Chicago Univ. IL., United States)
Date Acquired
September 6, 2013
Publication Date
January 1, 1993
Publication Information
Publication: Lunar and Planetary Inst., Twenty-fourth Lunar and Planetary Science Conference. Part 1: A-F
Subject Category
Nonmetallic Materials
Accession Number
Distribution Limits
Work of the US Gov. Public Use Permitted.

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